Vehicle Accessories Timer - SM155b

General Description:
The SM155b Battery Linker uses a microprocessor to automatically turn on Radio’s, CB’s, Fridges etc. when the vehicle engine has started.

A timer will power down this equipment 9 or 90 min. (selectable) after the vehicle engine has stopped.

You can leave critical equipment turned on in your vehicle, and know that you won’t flatten your battery

• The unit monitors the car battery voltage. When it decides that the engine is charging the battery An internal 10 Amp relay operates to connect power to your equipment.
  
• When the engine stops a timer is started. (this is selectable between 9 and 90 minutes by a jumper link inside the unit) When the time cycle is complete.
  
• A small beeper inside sends an ‘X’ in Morse Code when the timer is started and the letters ‘AR” when the Auxiliary Relay is turned OFF.
  
• A push button switch allows the user to manually override the timer to force the Appliance On or Off if required. (In case the operator forgets, This manual function will be automatically overridden the next time the vehicle is started.)
  
• The unit has a simple one wire to battery, one wire to your auxiliary equipment and one wire to vehicle earth’ for the electrical installation.
  
• An additional output is present (the small orange wire) that will allow a 12V external relay (not included) to force your car headlights OFF one minute after the engine has stopped. In foggy days etc. this will ensure that leaving your lights on will not flatten your battery while the car is unattended.
  
• Draws a low 3.6ma standby current from the vehicle battery.

SM155b Typical Wiring example
The module simply connects between the ‘+’ and negative ground terminals of the vehicle battery. All appliances, (radio, 12V fridge etc.) connect to the Yellow output wire. (10 amps maximum)

The Orange wire can be used to activate a standard auto relay wired in series with the vehicle headlamp circuit. This output is an electronic switch that will send a Negative signal (1A max) when the engine is running. This circuit will deactivate the headlamp 1 minute after the vehicle has stopped.

An LED indicator shows when the unit is active. A second LED indicator shows when the manual override for these features have been engaged after the Aux Timer button has been pressed. (The Manual Override control will automatically disengage the next time the vehicle is started. This prevents the output from being latched on indefinitely.)

Please note that some modern vehicles already have automatic deactivation of the headlamp features. This would remove the need for wiring this feature in your vehicle. If unsure how to correctly connect the headlamp circuit, seek professional assistance from an Automotive Electrician.

The more funcional SM155 is also available which includes a battery link solenoid.

SM155b VEHICLE ACCESSORIES TIMER
Release 1.0, MAY 2006

Manufactured in Australia by Alian Electronics Pty. Ltd.
408 Old Sale Rd. Drouin West 3818 Ph. (613) 5625 2545